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We were returning home from vacation yesterday when I experienced a strange transmission issue.

We were going up a hill, the explorer downshifted to accellerate, and when it shifted back up it clunked really hard, and the "O/D OFF" light started blinking slowly on the instrument panel. I had my wife look it up in the owner's manual while we drive the remaining 50 miles or so home.

Anyhow, I noticed this morning that it clunks more than normal engaging reverse from park, and drove it to the shop.

They pulled codes and got P0796. They recommended I take it to a transmission shop to have the work done.

In my research online it looks like the most likely culprit is the solenoid pack. I have an appt with a local transmission shop in a couple days to get the diag and repair estimate. I want to be somewhat informed about the possible issue before talking to the shop about what work needs to be done. If I bought the solenoid pack online and replaced it myself would it likely fix the issue?

Does this sound like the likely issue? Any advice would be greatly appreciated.

I've included a photo of the sticker inside the driver's door as well.

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It is a 5r55s according to your vin. You can get all your transmission parts at www.cascadetransmissionparts.com. The solenoid pack is just under $300.00.
The 5r55w and s are the same just different gear ratios. Very easy to install. See the videos on you tube.